That is a tough one. A few guys here really have their thumb on the used market of most rifles.

Is the extra barrel exclusive to the White Mountain Carbine action and stock only?? I don't think it is. I believe that barrel will also fit a Renegade frame.

If so then I would split the two up. And sell them separate.

The rifle should bring $200-$250. And the barrel should bring $100 or so to about anybody wanting a carbine barrel. I just saw a really nice TC Hawken sell for $250. And that is not real unusual to find that kind of deal. And I would value the WMC a little less than the TC Hawken. Just an opinion. Tom.